Image forming apparatus having a plurality of developing units a

Details Image forming apparatus having a plurality of developing units a Image forming apparatus having a plurality of developing units a

1991-01-15

1992-08-18

Moses, R. L.

Photocopying

Contact printing

Light boxes

355208, 355326, G03G 2100

Patent

active

051403722

ABSTRACT:
An image forming apparatus comprising first and second developing units each of which has detector for detecting toner density in the developing unit, input member for inputting toner replenishment instructions to each of the first and second developing units, and first and second replenishing members provided respectively to the first and second developing units for replenishing the toner in response to the input of the toner replenishment instructions by an operator. One of the first and second developing units is selected by the operator upon the copying. In this image forming apparatus, the replenishing members replenish the toner to the first and second developing units having toner densities of less than a predetermined value irrespective of the selection of the developing units.

REFERENCES:
patent: 4542985 (1985-09-01), Honma et al.
patent: 4952987 (1990-08-01), Takano
patent: 4963927 (1990-10-01), Ishihara

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